16401061 has 2 divisors, whose sum is σ = 16401062. Its totient is φ = 16401060.

The previous prime is 16401059. The next prime is 16401083. The reversal of 16401061 is 16010461.

It is a happy number.

16401061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 152100 = 4031^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 16401061 - 2¹ = 16401059 is a prime.

Together with 16401059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16401031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200530 + 8200531.

It is an arithmetic number, because the mean of its divisors is an integer number (8200531).

Almost surely, 2^16401061 is an apocalyptic number.

It is an amenable number.

16401061 is a deficient number, since it is larger than the sum of its proper divisors (1).

16401061 is an equidigital number, since it uses as much as digits as its factorization.

16401061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16401061 is about 4049.8223417824. The cubic root of 16401061 is about 254.0722973976.

It can be divided in two parts, 1640 and 1061, that added together give a triangular number (2701 = T₇₃).

The spelling of 16401061 in words is "sixteen million, four hundred one thousand, sixty-one".